/*
 * Copyright (C) 2010-2012 Enrique Lara (enrique.posix2.lara@gmail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
 * limitations under the License.
  */
package app.transitalarm;

import android.content.Context;

import android.os.PowerManager;

import app.transitalarm.util.Log;

final class AlertWakeLock {
    private static final String TAG = "AlarmAlertWakeLock";
    private static PowerManager.WakeLock sCpuWakeLock;

    static synchronized void acquireCpuWakeLock(final Context context) {
        Log.d(TAG, "Acquiring cpu wake lock");

        if (sCpuWakeLock != null) {
            return;
        }

        final PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
        sCpuWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE, TAG);
        sCpuWakeLock.acquire();
    }

    static synchronized void releaseCpuLock() {
        Log.d(TAG, "Releasing cpu wake lock");

        if (sCpuWakeLock != null) {
            sCpuWakeLock.release();
            sCpuWakeLock = null;
        }
    }
}
